rust/src/libsyntax/parse/classify.rs

/*
  Predicates on exprs and stmts that the pretty-printer and parser use
 */

use ast_util::operator_prec;

fn expr_requires_semi_to_be_stmt(e: @ast::expr) -> bool {
    match e.node {
      ast::expr_if(*) | ast::expr_match(*) | ast::expr_block(_)
      | ast::expr_while(*) | ast::expr_loop(*)
      | ast::expr_call(_, _, true) => false,
      _ => true
    }
}

fn expr_is_simple_block(e: @ast::expr) -> bool {
    match e.node {
      ast::expr_block({node: {rules: ast::default_blk, _}, _}) => true,
      _ => false
    }
}

fn stmt_ends_with_semi(stmt: ast::stmt) -> bool {
    match stmt.node {
      ast::stmt_decl(d, _) => {
        return match d.node {
              ast::decl_local(_) => true,
              ast::decl_item(_) => false
            }
      }
      ast::stmt_expr(e, _) => {
        return expr_requires_semi_to_be_stmt(e);
      }
      ast::stmt_semi(*) => {
        return false;
      }
    }
}